I am trying to connect to and use a network printer at a place where I will be working, which has a network printer already set up. It's a Brother MFC-465CN.I have opened up the CUPS site and entered details of the printer.

Hard to decide without knowing how they have the network printing setup. My guess would be you selected the right device at "Brother MFC-465CN 192.168.1.66 (Brother MFC-465CN)"

I think your big problem is that you do not have the appropriate ppd for the MFC-465. I don't think there is any chance that the ppd for MFC6550 will work. It looks like some other distro have additional packages for brother drivers https://wiki.ubuntu.com/BrotherDriverPackaging. I wonder what we have available in VL7.0 Gold-GG.

The printer will almost certainly accept the socket port 9100 connection.That's the most basic network printing protocol.

It will likely also accept lpd connections, but let's not try that atm.No idea if it can accept ipp connections.

For 'hostname', you need to either provide a name of the printer which can be resolved to it's IP address ( either in the hosts file or on the DNS server ), or you can just specify it's IP address and bypass name resolution.